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Virtual Wrench
Virtual Wrench, Chevy Mechanic
Category: Chevy
Satisfied Customers: 14620
Experience:  35 years Master Mechanic
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how do i change water pump for 1998 chevy c1500 4.3 v6

Customer Question

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Submitted: 10 years ago.
Category: Chevy
Expert:  Virtual Wrench replied 10 years ago.
  1. Disconnect the negative battery cable.

  2. Drain the radiator.

  3. Loosen the alternator and other accessories at their adjusting points, and remove the fan belts from the fan pulley.

  4. Remove the fan, fan clutch and pulley.

  5. Remove any accessory brackets that might interfere with water pump removal.

  6. Disconnect the hose from the water pump inlet and the heater hose from the nipple on the pump. Remove the bolts, pump assembly and old gasket from the timing chain cover.

To install:

  1. Make sure the gasket surfaces on the pump and engine block are clean.

  2. Install the pump assembly with a new gasket. Tighten the bolts to 15 ft. lbs. (20 Nm).

  3. Connect the hose between the water pump inlet and the nipple on the pump.

  4. Install any accessory brackets.

  5. Install the fan and pulley.

  6. Install and adjust the alternator and other accessories.

  7. Install the fan belts from the fan pulley.

  8. Fill the cooling system.

  9. Connect the battery.

4.3L, 5.0L, 5.7L and 7.4L Engines

See Figures 2, 3, 4, 5, 6, 7 and 8

Click image to see an enlarged view
Fig. 2: Disconnect the lower radiator hose from the water pump inlet


Click image to see an enlarged view
Fig. 3: Remove the water pump attaching bolts


  1. Disconnect the negative battery cable.

  2. Drain the coolant from the radiator. Remove the upper fan shroud.

  3. Remove the drive belt(s).

  4. Remove the alternator and other accessories, if necessary.

  5. Remove the fan, fan clutch and pulley.

  6. Remove any accessory brackets that might interfere with water pump removal.

  7. Disconnect the lower radiator hose from the water pump inlet and the heater hose from the nipple on the pump. On the 7.4L engine, remove the bypass hose.

  8. Remove the bolts, then pull the water pump assembly away from the timing cover.

To install:

  1. Clean all old gasket material from the timing chain cover.

  2. Install the pump assembly with a new gasket. Tighten the bolts to 30 ft. lbs. (41 Nm).

  3. Connect the hose between the water pump inlet and the nipple on the pump. Connect the heater hose and the bypass hose (7.4L only).

  4. Install the fan, fan clutch and pulley.

  5. Install and adjust the alternator and other accessories, if necessary.

  6. Install the drive belt(s). Install the upper radiator shroud

  7. Fill the cooling system. Connect the battery.

Click image to see an enlarged view
Fig. 4: Remove the water pump from the vehicle


Click image to see an enlarged view
Fig. 5: Using a scraper, clean the old gasket from both mating surfaces of the water pump

 

If you have further questions on this, just reply.

Thanks for asking!

V W